Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.
Upcoming SlideShare
Loading in …5
×

T3 magnetic circuits

1,387 views

Published on

Published in: Technology, Business
• Full Name
Comment goes here.

Are you sure you want to Yes No
Your message goes here
• Login to see the comments

• Be the first to like this

T3 magnetic circuits

1. 1. ELE101 / 102 Dept of E & E Engg, MIT Manipal 1 Tutorial [1] A circular iron ring has a mean circumference of 1.5m and a cross sectional area of 0.01m2 . A saw cut of 4mm wide is made in the ring Calculate the magnetizing current required to produce a flux of 0.8mWb in the air gap if a ring is wound with a coil of 175 turns. Assume μr = 400, λ = 1.25 What is the current required if the leakage flux is neglected? Ans: 3.156 A, 2.816 A
2. 2. ELE 101 / 102 Dept of E & E Engg, MIT Manipal 2 [2] A steel ring 10 cm mean radius and of circular cross-section 1 cm in radius has an air gap of 1 mm length. It is wound uniformly with 500 turns of wire carrying current of 3 A. The air gap takes 60 % of the total MMF. Neglecting magnetic leakage find the total reluctance 4.22178 × 106 AT / Wb Tutorial
3. 3. ELE 101 / 102 Dept of E & E Engg, MIT Manipal 3 [3] The magnetic frame shown in figure is built up of iron of square cross section of 3 cm side and each air gap is 2 mm wide. Each of the coil has 1000 turns and the exciting current is 1 A. The µr of part A and part B may be taken as 1000 and 1200 respectively. Calculate (i) Reluctance of part A (ii) Reluctance of part B (iii) Reluctance of air gaps (iv) Total Reluctance of complete magnetic circuit (v) MMF produced and (vi) Flux set up in the circuit PART A PART B 3 cm 10 cm 2 mm 3 cm 20 cm Tutorial 0.17684 × 106 AT / Wb, 0.2505 × 106 AT / Wb, 3.537 × 106 AT / Wb, 3.9643 × 106 AT / Wb, 2000 AT, 0.5045 mWb
4. 4. ELE 101 / 102 Dept of E&E MIT Manipal 1 Tutorial [4] A magnetic circuit made of silicon steel is as shown. The central limb has a cross sectional area of 800 mm2 and a coil of 500 turns. Each of the side limbs has an area of 500 mm2 . Calculate the magnetizing current required to produce a flux of 1 mWb in the 1 mm air gap if μr=1000, length BE = 150 mm; length BAGIDE = length BCHJFE = 250 mm. Assume a leakage factor of 1.2 1mm 5mm A B C D E F G H I J ANS: 4.58 A
5. 5. ELE 101 / 102 Dept of E & E Engg, MIT Manipal 5 Tutorial Φ 1 Φ2 Φ3 A B C DE F [5] A 710 turns coil is wound on the central limb of the cast steel symmetrical frame of uniform cross section 16 cm2 is as shown. Calculate the current required to produce a flux of 1.8 mWb in an air gap of 0.2 cm length. Given lAFEB = lACDB = 25 cm, lAB = 12.5 cm. The magnetization details is as follows H 300 500 600 700 900 1092 B 0.1 0.45 0.562 0.775 1 1.125 Ans: I = 2.92 A
6. 6. ELE 101 / 102 Dept of E & E Engg, MIT Manipal 5 Tutorial Φ 1 Φ2 Φ3 A B C DE F [5] A 710 turns coil is wound on the central limb of the cast steel symmetrical frame of uniform cross section 16 cm2 is as shown. Calculate the current required to produce a flux of 1.8 mWb in an air gap of 0.2 cm length. Given lAFEB = lACDB = 25 cm, lAB = 12.5 cm. The magnetization details is as follows H 300 500 600 700 900 1092 B 0.1 0.45 0.562 0.775 1 1.125 Ans: I = 2.92 A